aku soku zan 

The more poetic translations are "Swift death to evil" and "Slay evil immediately."

Aku = Evil
Soku = Immediate (more emphasis on "immediate" as opposed to "swiftly" or "quickly")
Zan = Slay (Depending on how you see it; literally it means "chop" but this changes slightly in context. Here it probably means "slay".

It is a motto that united soldiers in late 19th century Japan, during the period of the Meiji Revolution.

Though some may consider such a "law" an extreme measure, those who followed it did so religiously. Believing that no matter what side they fought for, that as long as they upheld Aku Soku Zan, they would accomplish their mission.

aku soku zan by Mytheos-ASB February 4, 2007

aku soku zan 

Slay evil immediately

The code of Hajime Saitou of the Shinsingumi. This may or may not apply to all members of the Shinsingumi. It is at least what many strived to do.

aku soku zan by Rayo September 25, 2003

aku soku zan 

Sin. Swift. Slay. Often translated as kill evil swiftly.

aku soku zan by WannaBeSaitoh'sGirl August 5, 2003

aku soku zan 

Means "Evil swiftly kill". Phrase of the Shinsengumi.

Aku. Soku. Zan.

aku soku zan by Himura May 28, 2003

aku soku zan 

used by the captain of the first shinsengumi unit saito hajime meaning swift death to evil

cant think of anything to put that contains the words aku soku zan

aku soku zan by fayte October 17, 2006